A little OT: People here are always talking about trading stocks, anyone dabble in forex?
A caveat emptor on FX trading worth reading: http://tickerforum.org/akcs-www?post=23331
The claims about costs are stated in a weird way. The absolute cost of the trade doesn't change based on your leverage, just the cost as percentage of the margin requirement. I guess they're just trying to say you can blow up your account faster with high leverage.
You can also find brokers that don't do roll over and will even pay you interest on open positions for certain pairs.